The very thing that makes the Slide Fire stock so much fun can also be its undoing: rapid fire. Without adequate cooling, your carbine will shut down in short order. The Slide Fire 2-piece Hand Guard is designed with upper and lower heat shields for maximum cooling. It accommodates gas piston or direct gas impingement systems and it's designed to fit AR-15 platform carbine-length rifles. The high strength polymer material is half the weight of aluminum hand guards, and it will accommodate mil-spec rail systems for customization.